Hydraulics And Transaxles; Mower Blades - Gravely Promaster PM 250Z Operator's Manual

HYDRAULICS AND TRANSAXLES

WARNING
HYDRAULIC FLUID can result in severe burns. Fluid
in hydraulic system can penetrate skin and result in
serious injury or death.
Be sure to stop the engine before doing any work on
hydraulic parts.
Keep body and hands away from pin holes or nozzles
which expel hydraulic fluid when under pressure. Use
paper or cardboard, not hands, to search for leaks.
Insure all hydraulic fluid connections are tight and all
hydraulic hoses and lines are in good condition before
applying pressure to system.
FOREIGN FLUID INJECTED INTO BODY can result
in gangrene. Fluid must be surgically removed within a
few hours by a doctor familiar with this form of injury.
Checking the Hydraulic Fluid Level
A check of the hydraulic fluid level should be made daily.
NOTE: The oil level can be checked with dipstick check.
To Check: first remove any dirt that may be around the
cap on the tank.
The oil level should be between two marks on dipstick.
Centered between the marks is best.
Add oil through the dipstick tube as needed. Do not
overfill.
Changing Hydraulic Fluid
The hydraulic oil filter and hydraulic oil should be
changed after the first 500 hours. Use Mobil 15W50
synthetic oil for best component life.
1. Clean around dipstick cap and dipstick. Remove
dipstick.
2. Place container under oil filter to catch oil.
3. Remove oil filter.
4. Allow tank to drain.
5. Install new oil filter.
6. Add new oil to the oil tank. It will take about 5 quarts.
Use Mobil 15W50 synthetic oil for best pump and
wheel motor life.
7. Properly dispose of waste oil.
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MOWER BLADES

NOTE: If mower is used under sandy soil conditions,
replace blades when air lifts become eroded through at
ends (Figure 12).
2
3
4
1. Cutting Blade
2. Square Corner
Figure 12
Sharpen the Mower Blades
CAUTION
Use sturdy gloves or padding to protect hands when
working with mower blades.
1. Turn the engine off. Remove the ignition key. Remove
the ignition wire from the spark plugs.
2. Remove the bolts, lock washer, the flat washers, and
the blades from the spindle shafts.
3. Sharpen the beveled edges of the blades in a straight
line. Do not change the angle of the beveled edge. If
more than 0.5 inches (12.7mm) are removed from
the width of a blade, discard the blade. Make sure the
sharpened blades are balanced. Balance must be
held within 1.3 inch ounces.
4. Put the blades, the flat washers, lock washers, and
the bolts back on the spindle shafts.
5. Tighten the bolts to a torque of 70 ft. lbs.
6. Put the ignition wires back on the spark plugs.
1
3. Air Lift Erosion
4. Air Lift
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